<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>按钮边框颜色</title>
    <style>
        /* 我们可以使用 border 属性设置按钮边框颜色: */
        .button {
            /* Green */
            background-color: #4CAF50;
            border: none;
            color: white;
            padding: 15px 32px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
        }

        .button1 {
            background-color: white;
            color: black;
            border: 2px solid #4CAF50;
        }

        .button2 {
            background-color: white;
            color: black;
            border: 2px solid #008CBA;
        }

        .button3 {
            background-color: white;
            color: black;
            border: 2px solid #f44336;
        }

        .button4 {
            background-color: white;
            color: black;
            border: 2px solid #e7e7e7;
        }

        .button5 {
            background-color: white;
            color: black;
            border: 2px solid #555555;
        }
    </style>
</head>

<body>

    <h2>按钮边框颜色</h2>
    <p>我们可以使用 border 属性设置按钮边框颜色:</p>

    <button class="button button1">Green</button>
    <button class="button button2">Blue</button>
    <button class="button button3">Red</button>
    <button class="button button4">Gray</button>
    <button class="button button5">Black</button>

</body>

</html>